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Okay these are probably stupid questions but in my skimming of the rules I missed it.

I have read some things online but cannot find them in the codex, the first is someone said a group of 20 horrors with the herald get s6 on the primaris change power instead of s5, and tzeentch's get to reroll all 1's no matter what? how does that happen? Is someone just talking out of nowhere or is this me?

Read the rules on the Locus of Conjuration that you can buy for the heralds, it affects Flicker Fire. Tzeentch's re-roll is explained in the codex as well, in the rules for 'Daemon of Tzeentch' and tells when they can re-roll 1s (not on everything).